PILLAR

n. Pi2l'a3r. Gr., KUOV. Lat., column a. Fr., pilier. Ger., Sdule. A column or upright support; also a structure resembling a column. |C; a, 17. ] Anterior p. of the fauces. See ARCH of the palate. Anterior p's of the fornix. Lat., crura anterior a fornicis. Fr., pilier (ou colonne) anterieur (de la voute, ou du trigone). Ger., vordere Geuolbsciule. Two diverging columns that extend downward from the anterior extremity of the body of the fornix, anterior to the foramen of Monro, along the sides of the third ventricle. On reaching the corpora albicantia at the base of the brain they turn backward and upward, each column being continued upward to the anterior nucleus of the optic thalamus. [I, 15 (K).] External p. of the abdominal ring. The outer aponeurotic margin of the external abdominal ring, formed by a portion of Poupart's ligament. [L, 142.] External p's of the diaphragm. Lat., crura diaphragmatic a (seu diaphragm at is) extern a. Ger.. du ere Schenkelpaare. The outermost portion of the pillars of the diaphragm. Inferior p. of the abdominal ring. See External p. of the abdominal ring. Internal p. of the abdominal ring. The inner aponeurotic margin of the external abdominal ring. [L, 332.] Internal p's of the diaphragm, Middle p's of the diaphragm. Lat., crura diaphragmatic a (seu diaphragmatos) intern a, crura diaphragmatic a (seu diaphragmatos) media. Ger., iniiere (oder mittlere) Schenkelpaare. The innermost portion of the p's of the diaphragm. [L.] Muscular p's. See JVfuscte-coLUMNS. P's of Corti. See RODS of Corti. P's of the diaphragm. Lat., crura diaphragmatos. Bundles of tendinous fibres which arise on the right side from the anterior surfaces of the first, second, and third lumbar vertebrae and the intervertebral fibrocartilages, and on the left side from the anterior surfaces of the second and third lumbar vertebrae, and pa upward and outward, forming an arch over the aorta (hiatus aortic us). On each side of the aorta the fibres become muscular and decu ate with each other, and, after parting to form an opening for the oesophagus (hiatus cesophageus), are lost in the central tendon. [L, 31, 142, 332.] P's of the fauces. The folds of mucous membrane between which the tonsil is situated. Posterior p. of the fauces. See ARCUS palatopharyngeus. Posterior p's of the fornix. Lat., crus fornicis posterior. Fr., piliers posterieurs (de la voute. ou du trigone). Ger., hiiitere Gewolbficiule. The two bands forming the prolongation of the fornix posteriorly. They extend downward and outward, leaving between them the lyra, enter the cornua of ihe lateral ventricles, and terminate partly in the hippocampus major and partly as the taenia hippocampi. [I. 23.] Superior p. of the abdominal ring. See Internal p. of the abdominal ring. [s. 269]